The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 04, 1993
Filed:
Feb. 28, 1991
Yasushi Sato, Hamamatsu, JP;
Abstract
A fluctuation generator for use in an electronic musical instrument comprises uniform random generator for generating a random number having a uniform probability distribution, and a function circuit, which receives the random number from the uniform random generator and produces a random number MOD having a probability distribution according to a predetermined function. The function circuit may be constituted by a ROM. The fluctuation generator generates a tone signal in accordance with the random number MOD from the function circuit. According to this fluctuation generator, the uniform random generator generates a random number having a uniform probability distribution, and sends it to the function circuit. The function circuit generates a random number in accordance with a function having a predetermined input/output characteristic to thereby generate a random number having a probability distribution close to the natural distribution (for example, a random number with the normalized distribution). A tone signal will be generated in accordance with this random number (for example, by adding the random number to a wave read frequency). A musical tone generated based on this tone signal should have fluctuation closer to the natural one.